学进去-教育应平等而普惠
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类型:听音,选择正确答案
难度系数:0.65
所属科目:小学英语
听录音,选择最佳答语。
(      ) 1. A. Yes, she is.                          B. Yes, he is.                    C. Yes, it is.
(      ) 2. A. She is my friend.             B. He is my friend.            C. They’re my friends.
(      ) 3. A. Yes, I am.                           B. No, I can’t.                   C. No, I don’t.   
(      ) 4. A. I am singing.                    B. We can sing.              C. We often sing.
(      ) 5. A. At six o’clock.                    B. In the kitchen.               C. Eat breakfast.
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y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

用户名称
2019-09-19

y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

用户名称
2019-09-19
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